The Zoom Tool lets you zoom in and out of your page. When using the tool a zoom window will appear on the top right side, allowing you to zoom in and out, move around on your page and change to a specific zoom-%.
|Zoom||Zoom Out||Area Zoom|
The Area Zoom lets you mark the area you want to magnify. Tap the Area Zoom icon, and use the marker to circle the object you want to magnify.